Power drill



Aug. 31, 1937. D. JOHNSTON 2,091,850

POWER DR'ILL Filed Nov. is, 1936 s Sheets-Sheet 1 ATTORNEYS D. JOHNSTON Aug. 31, 1937.

POWER DRILL Filed Nov. 16, 1936 3 Sheets-Sheet 2 INVENTOR I WW ATTORNEYS D; JOHNSTON Aug. 31, 1937.

POWER DRILL Filed Nov. 16, 1936 5 Sheets-Shoat 3 m yzm fl |ll|ll|l lllllll I l rm Patented Aug. 31, 1937 UNITED STATES PATENT OFFICE rowan DRILL Dick Johnston, Charleston, Nev. Application November 16, 1936, Serial No. 111,126

Claims. (01. 255-51) the bed and extend transversely thereof. The

This invention relates to power operated drills especially adapted for mining purposes and has for the primary object the provision of a portable and inexpensive device of this character which may be easily assembled and disassembled for carrying from one inaccessible place to another and may be readily adjusted for different kinds of drilling operations. Y

With these and other objects in view, this invention consists in certain novel features of construction, combination: and arrangement of parts to be hereinafter more fully described and claimed. Y

For a complete understanding of my invention, reference is to be had to the following description and accompanying drawings, in which Figure 1 is a top plan View illustrating a power operated drill constructed in accordance with my invention.

Figure 2 is an end elevation illustrating the same.

Figure 3 is a Vertical sectional view taken on the line 3-3 of Figure 1.

Figure 4 is an end elevation illustrating the device.

Figure 5 is a transverse sectional view taken on theline 5--5 of Figure 2.

Figure 6 is an enlarged fragmentary vertical sectional view illustrating the means for imparting movement to the drill element.

Figure 7 is a sectional view taken on the line 1-1 of Figure 6.

Figure 8 is an end view, partly in section, showing a chuck to receive a tool of a certain construction.

Figure 9 is an end view partly in section showing the chuck With a tool of a different design and construction.

Referring in detail to the drawings, the numeral l indicates a support of a size and shape so as to be accommodated in spaces of small sizes and may be conveniently carried. The. support includes guides 2 extending longitudinally thereof to slidably support a bed 3. The bed is capable of moving endwise of the support and has secured thereto a journal 4 to which is rotatably connected a feed shaft 5. The feed shaft is received by a feed nut B secured to the support and one end thereof is provided with a crank handle 1. The'feed shaft 5 is employed for manually moving the bed endwise of the support and in either direction relative to the latter.

Spaced arcuate shaped brackets 8 are secured to the bed and are provided with a series of openings 9. Shafts l0 and II are journaled on shaft lil receives power-from an electric motor 52 mounted on the bed and is belted to the shaft H, as shown at 13. The shaft I0 is belted to the armature shaft of the motor. Arms M are journaled on the shaft. and operate between the brackets 8 and lie in close proximity to the latter and are provided with openings to receive pins l5. The pins are adapted to enter selected openings 9 for the purpose of securing the arms M at various inclinations with respect to the support and bed. The arms have journals I6 supporting a shaft ill. The shaft I7 is further supported by a journal i8 connected to the arms by braces it, the latter being offset or curved so as not to interfere with a belt 20 employed for connecting the shaft I l to the shaft l1.

Removably secured to either end of the shaft i7 is a fly wheel 2| received within a sectional housing 22 and which slidably supports a hammer or plunger 23. A pitman 24 is eccentrically secured to the fly wheel and pivotally connected to the hammer or plunger 23 for reciprocating the latter and includes sections pivotally and slidably connected, as shown at 25. A cushion spring 26 acts on the hammer or plunger for absorbing shocks and jars. Detachably secured to the plunger or hammer is a tool chuck 21 provided with a socket 28 capable of receiving a drill bit 29. The socket 28 will receive a drill bit of rectangular shape in cross section or of octagon shape in cross section, as shown in Figure 8, and the'walls of the socket are provided with grooves 30 which communicate with an air passage 3| having lateral branches 32 opening outwardly through opposite sides of the chuck for the purpose of permitting air to be forced into and out of an opening being formed by the reciprocation of the drill bit for the purpose of clearing drillings from the hole.

Set bolts 33 are employed for securing the chuck to the. hammer or plunger and for securing the drill bit in the chuck.

All of the various parts described are so constructed and arranged that they may be readily separated from one another so that this device can be taken apart for the convenience of handling within inaccessible places. The housing 22 is removably secured to one of the arms l4 and has the shaft ll extending therein. By adjusting the arms I4 along the brackets 8 the drill bit or tool carried by the chuck can be made to assume various positions for carrying out various kinds of drilling operations.

Having described the invention, I claim:

means between said shafts, and a tool operating means operated by the second shaft.

2. A portable power driven mining drill comprising a support, a bed slidable on said support to be adjusted towards and from the work,

means for adjusting said bed, a shaft journaled on the bed, power means carried by said bed and connected to the shaft, arms journaled on said shaft, means for supporting said arms at various inclinations, a second shaft supported by said arms and driven by the first shaft, connecting means between said shafts, a housing receiving one end of the second shaft carried by one of the arms, a fly wheel secured to the last-named end of the second shaft, a hammer slidably supported by said housing, a pitman connected to the hammer and eccentrically connected to the fly wheel for reciprocating the hammer, and a tool chuck carried by said hammer.

3. A portable power driven mining drill comprising a support, a bed slidable on said support to be adjusted towards and from the work, means for adjusting said bed, a shaft journaled on the bed, power means carried by said bed and connected to the shaft, arms journaled on said shaft,

means for supporting said arms at various inclinations, a second shaft supported by said arms and driven by the first shaft, connecting means between said shafts, a housing receiving one end of the second shaft carried by one of the arms, a fly wheel secured to the last-named end of the second shaft, a hammer slidably supported by said housing, a pitman connected to the hammer and eccentrically connected to the fly wheel for reciprocating the hammer, a tool chuck carried by said hammer, said pitman including sections pivotally and slidably connected, and a cushion means for the hammer.

4. A power drill comprising a support, a bed a slidable on said support, a feed shaft connected to the bed, a feed nut secured to the support and in mesh with the feed shaft, an adjustable supporting means carried by said bed and including a shaft, a power source carried by the bed, means connecting the power source to the shaft, a hammer reciprocated by said shaft, a housing slidably supporting the hammer, a tool chuck detachably connected to the hammer and provided with a tool receiving socket having grooves in the walls thereof, said chuck having communicating passages arranged in communication with the grooves and opening outwardly through opposite sides thereof.

5. A power drill comprising a supporting means, a power source carried by said means, an adjustable support including a shaft and parallel arms for supporting the latter carried by said supporting means, means for transmitting power from the source to said shaft, braces connected to said arms, a bearing carried by said braces for the shaft, and a tool operating mechanism driven by said shaft.

DICK JOHNSTON. 

